|Publication number||US6933833 B1|
|Application number||US 10/223,431|
|Publication date||Aug 23, 2005|
|Filing date||Aug 19, 2002|
|Priority date||Oct 14, 1987|
|Also published as||US6720904|
|Publication number||10223431, 223431, US 6933833 B1, US 6933833B1, US-B1-6933833, US6933833 B1, US6933833B1|
|Inventors||Paul V. Darbee|
|Original Assignee||Universal Electronics Inc.|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (11), Referenced by (30), Classifications (35), Legal Events (3)|
|External Links: USPTO, USPTO Assignment, Espacenet|
This patent application claims the priority date of U.S. application Ser. No. 07/109,336 filed on Oct. 14, 1987, now abandoned, as a divisional application of U.S. application Ser. No. 09/871,872, filed Jun. 1, 2001, now U.S. Pat. No. 6,496,135, which is continuation of U.S. application Ser. No. 09/791,354 filed on Feb. 23, 2001, now U.S. Pat. No. 6,587,067, which is a continuation of U.S. application Ser. No. 09/408,729 filed on Sep. 29, 1999, now U.S. Pat. No. 6,195,033, which is a continuation-in-part of U.S. application Ser. No. 07/990,854 filed on Dec. 11, 1992, now U.S. Pat. No. 6,014,092, which is a continuation-in-part of U.S. application Ser. No. 07/913,523 filed on Jul. 14, 1992, now abandoned, which is a continuation-in-part of U.S. application Ser. No. 07/586,957 filed on Sep. 24, 1990, now abandoned, which is a continuation-in-part of U.S. application Ser. No. 07/127,999 filed on Dec. 2, 1987, now U.S. Pat. No. 4,959,810, which is a continuation-in-part of U.S. application Ser. No. 109,336.
This patent application contains the specification of U.S. application Ser. No. 07/127,999 filed on Dec. 2, 1987, now U.S. Pat. No. 4,959,810.
1. Field of the Invention
The present invention relates to a universal remote control device of the type which is hand held and which can be coupled via coded infrared signals with a remote control receiver built into a television or other remotely controlled electrical apparatus to turn on the apparatus, such as the television, at a distance, to adjust the volume, tone and brightness, to change channels, and to turn the television off.
Additionally, the present invention relates to a method for acquiring the infrared codes for a controlled apparatus, such as a television, generating code data related to these infrared codes for storage in a remote control device and methods for using the remote control device for finding, in a library or table of code data for generating infarared codes for operating different electrical apparatus manufactured by different manufacturers stored in a RAM of the remote control device, the code data for generating infrared coded signals for operating a particular apparatus, such as a television, and then for using the stored code data for generating the coded infrared signals for operating the controlled apparatus.
2. Description of the Prior Art
Heretofore it has been proposed to provide a reconfigurable remote control device and programmable functions for such a remote control device which will enable one to learn, store and retransmit infrared codes that are emitted from the controller for a remotely controlled apparatus, such as a television.
For example, in the Welles II U.S. Pat. No. 4,623,887 and the Ehlers U.S. Pat. No. 4,626,848, there is disclosed a reconfigurable remote control device which has the ability to learn, store and repeat remote control codes from any other infrared transmitter. Such a reconfigurable remote control transmitter device includes an infrared receiver, a microprocessor, a non-volatile random access memory, a scratch pad random access memory, and an infrared transmitter.
According to the teachings of the Ehlers patent, the infrared signals received by the remote control device are in bursts of pulses and the device counts the number of pulses in each burst as well as the time duration of each pause in a transmission between bursts.
As will be described in greater detail hereinafter, the universal remote control device of the present invention utilizes a single non-volatile RAM does not provide a separate scratch pad RAM or, more importantly, a ROM.
In learning the infrared code and transforming same to code data which is then stored in a RAM of the control device and later used to generate infrared codes, a novel method is utilized wherein no counting of pulses takes place, and only the time duration of the pulses in a burst of pulses from the leading edge of the first pulse in a burst of pulses to the trailing edge of the last pulse in the burst as well as the time duration of the pause between bursts are sensed and used to learn and later to generate the infrared codes.
Additionally, unique methods for use of the remote control device are provided so that a number of infrared operation code sequences can be generated by the remote control device for operating various types of electronic apparatus.
According to the invention there is provided a universal remote control system having input means for inputting commands, signal output means for supplying infrared signals to a controlled device, a central processing unit (CPU) coupled to the input means and to the signal output means, a single non-volatile, read-write RAM (such as a battery-backed RAM) coupled to the central processing unit and data coupling means including terminal means coupled to the CPU for enabling new code data to be supplied from outside the system to, or retrieved from the RAM through the terminal means and the CPU.
Further according to the invention, there is provided a method of loading a RAM in a ROM-less microprocessor system comprising a central processing unit, a single non-volatile, read-write RAM, input means, output means, and means for coupling said central processing unit, said RAM, said input means, and said output means together, said method including the steps of:
Still further according to the present invention, there is provided a process of learning, storing and reproducing the remote control codes of any of a diverse plurality of remote control transmitters, comprising the steps of:
Referring now to
As shown, the device 10 includes a housing 11 including an upper housing member 12 having a base panel 14, and a lower housing member 16. An overlay face panel 18 is positioned over the base panel 14.
The two panels 14 and 18 have openings 22 and 24 (
The pushbuttons 25 are arranged in rows and columns and are identified as follows on the overlay face panel 18:
VCR 1 Cable TV Power VCR 2 CD DO 1 DO 2 Rec TV.VCR Stop Pause Rew Reverse Play Fast Fwd Mute 1 2 3 Vol Up 4 5 6 Vol Dn 7 8 9 0 Enter CH Up Recall CH Dn DO A C E G B D F H
This arrangement is shown in FIG. 15 and the manner in which these pushbuttons 25 are utilized in operating the control device 10 will be described in greater detail in connection with the description of
At a top or forward end 28 of the device 10, there is provided an opening 30 for three light emitting diodes, LED 1, LED 2 and LED 3. The opening 30 is covered by an infrared-transport lens 31. Also, provided on a top surface 32 of the upper housing member 12 of the control device 10 is a light emitting diode, LED 4, by which information, in the form of red and green blink codes, is communicated to the user of the device 10.
It will be noted that the base panel 14 of the upper housing member 12 has pushbutton openings 24 completely across each one of fourteen (14) rows across and four (4) columns down. However, not all of these openings or holes 24 have pushbuttons 25 extending therethrough, as noted by the lesser number of pushbutton-receiving openings 22, in the overlay face panel 18. Likewise, the body panel 26 initially has pushbuttons 25 arranged completely across the upper surface 34 thereof in fourteen (14) rows across and fourteen (14) columns down.
The printed circuit board 36 has conductive switches 38 aligned with each one of the pushbuttons 25 so that more switches 38 are provided than may be necessary for this particular control device 10.
The availability of additional pushbutton openings 24 in the base panel 14 will enable the control device 10 to be modified as necessary by the addition of further pushbuttons 25 to perform numerous other functions as called for.
This mechanical construction of the upper and lower housing members 12 and 16 and the panels 14 and 18 and circuit board 36 enable the control device 10 to be modified to include additional circuits in the operating circuitry 42 and pushbutton switches 25 for performing additional functions, if desired. In this respect, overlay face panel 18 is easily replaceable to modify the device 10 to include more or less pushbuttons 25 and associated switches 38.
The simplicity of the construction of the pushbuttons 25, the base panel 14 and the overlay panel 18 is shown in
Then, the pushbutton body panel 26 is moved into engagement with the base panel 14, as shown in
After the pushbutton body panel 26 and the base panel portion 14 have been assembled as shown in
Referring now to
A block schematic circuit diagram of the operating circuitry 42 is shown in FIG. 8 and includes CPU 56, the infrared light emitting diodes, LED 1, LED 2, and LED 3 coupled to the CPU 56, serial input/output ports 60 of CPU 56, the RAM 54 coupled to CPU 56 and backed up by lithium battery 52 and a 4×14 keyboard 61 coupled to CPU 56. The four AAA batteries 46 are also shown.
The operating circuitry also includes several subcircuits. One of those subcircuits 62 (
Accordingly, whenever a button 25 is pressed, it will increase the voltage on line VCC which initiates a switching process in a wake up circuit 70 for “waking up” or energizing the CPU 56 in the manner described below.
In addition to the keyboard circuit 62 and the wakeup circuit 70, the subcircuits include a reset circuit 74, and a write protect circuit 78.
When the voltage on line VCC goes up, a signal is passed through capacitor 102, to the base of a transistor 104 in the wake up circuit 70. This turns on the transistor 104 which in turn turns on transistor 106 This turning on of the transistors 104 and 106 will bring voltage on line VCC to the full DC voltage of about 5½ volts. When the voltage on line VCC reaches 5½ volts, the CPU 56 begins to operate.
When operating, the CPU 56 establishes a signal on line ALE 108 which is passed through a resistor 110 and filtered by capacitor 102. Once the ALE signal is established, it causes a voltage to be generated at the base of transistor 104, maintaining transistor 104 turned on, which in turn maintains transistor 106 turned on, thus enabling the CPU 56 to continue to run. The CPU 56 can turn itself off by executing a HALT instruction which causes the ALE signal to cease, thus turning off transistors 104 and 106 and removing power via line VCC to the CPU 56.
It is to be noted that the wake up circuit 70 can be activated by depression of a key or button 25 or by an input signal at serial port 3 coupled to an input port 112 of the CPU 56.
The circuit elements described above form the wakeup circuit 70 for activating the operating circuitry 42 of the device 10. This circuit uses substrate static-protection diodes 114 in a CMOS chip coupled to the keyboard 61. With this arrangement, source current is supplied to transmitter 104 via line VCC when a key or pushbutton 25 is depressed.
The RAM 54 is connected to the lithium battery 52 and, when the device 10 is not being used, draws about 20 nanoamps from the battery 52, which gives the device 10 a shelf life between 5 and 10 years. A backup capacitor 116 is coupled to the RAM 54 and has (at 20 nanoamps) a discharge time of about 10 minutes, providing ample time to change (if necessary) the battery 52 without losing the instructions and data stored in the RAM 54. Capacitor 116 is kept charged by battery 46 through diode 117 when the device 10 is operating and, at other times, by battery 52 through diode 118.
After the CPU 56 has been powered up, or awakened, the CPU 56 makes a scan of row lines 121-128 to the keyboard 61 by sequentially forcing each line 121-128 low and then polling the other lines to find out which button 25, such as button 25′, has been pressed. As a result of pushbutton 25′ being pressed, a low impressed upon row line 121 will cause a low on column line 128 and that will result in the row line 128 being low.
The CPU 56 first sets row line 121 low and then begins scanning, starting with the row line 122, for another row line having a low voltage thereon and by finding the row line with the low voltage, in the above example, row line 128, the CPU 56 knows that button 25′ at the intersection of row line 128 and column line 138 has been depressed.
If the CPU 56 had not found a low on another row line, such as row line 128, after having set line row 121 low, line 121 is returned to its previous value and row line 122 is then set low, and the scan continued until a low row line is found to identify which button 25 has been depressed.
When the CPU 56 determines which pushbutton 25 has been depressed the CPU 56 will then know what function is to be carried out.
It is to be noted that the keyboard circuit 62 is uniquely designed to include only eight (8) row lines 121-128 and eight (8) column lines 131-138 each having a resistor 64 and a current directing diode 114 therein and each being arranged across the row lines 131-138 so that 56 switch positions are provided with only eight (8) lines.
All memory cycles exercised must involve the latch 58 because the CPU 56 has its data bus multiplexed with the lower 8 bits of the address bus on lines 141-148.
Coming out of the CPU 56 to the latch 52, is a group of nine (9) lines 108 and 141-148. One of the lines, line 108, carries the ALE signal. The eight (8) lines 141-148 between the latch 58 and the CPU 56 are the multiplexed data and address bus lines. These lines comprise the lower 8 bits of the address bus. A group of multiplex lines are identified with reference numeral 150. Five more lines 151-155 comprise the upper five bits of the address bus, making a total of 13 bits of address.
An inverting OR gate 156 having an output line 158 and two input lines 160 and 162 together with ground line 164 are coupled between the CPU 56 and the RAM 54. The line 158 defines an output enable for the RAM 54.
Accordingly, when the CPU 56 wants to do a read, it actuates either of the two input lines 160 or 162 going into the OR gate 156. Line 160 is a PSEN line for telling the RAM 54 that it is to be enabled to receive data and line 162 in a Read Output line to tell the RAM 54 that the CPU is going to read the information stored in the RAM 54. With OR gate 156 the two lines and functions are combined on one line 158. In other words, the CPU 56 tells the RAM 54, through the OR gate 156, that it wants to read information stored in the RAM 54.
The circuitry 42 also includes the write protect circuit 78 which has the double duty of being a low battery indicating circuit. The circuit 78 includes a resistor 170, a transistor 171, two resistors 172, 173 and a Zener diode 174 connected as shown.
A write enable line 176 is connected between the transistor 171 and the CPU 56.
When the CPU 56 desires to write information into the RAM 54, it places the address on the address bus lines 141-148 and 151-155, strokes the lower 8 bits of the address bus on lines 141-148 into the latch 58 using ALE line 108, places the information on the data bus lines 141-148, and then brings the write enable line 176 low.
When the write enable line 176 goes low, unless the transistor 171 is turned on by virtue of the battery voltage being more than 4.3 volts, a line 178 going into the RAM 54 at the collector 180 of the transistor 171 (which is the “write enable” for the RAM 54), is prevented from going low, maintaining the RAM “Write Protected”. This condition also is created when the battery 48 is low. The “write enable” line 176 also functions as a low battery detector because, during execution of the program, a check is made to see whether writing to the RAM 54 is enabled. If it is not, this shows that the batteries are weak and a signal is sent to the user by flashing the red LED, of LED 4, 5 times.
Note that LED 4 includes a red LED and a green LED incorporated into one package so that when both LEDs are turned on, a yellow light is emitted, making LED 4 a tricolor LED. Such tricolor LED 4 enables the device 10 easily to communicate to the user by way of the color, number and sequence of light blinks.
A clock circuit 182 including a crystal resonator is coupled to the CPU 56.
Three serial ports 1-3 are coupled to the CPU 56 and include port 1 which is a transmitting port, port 2 which is ground and port 3 which is a receiving port. Serial port 1 is connected to row line 121 so that data can be serially transmitted in the form of highs and lows by CPU 56 from the RAM 54 over row line 121 to serial port 1. Incoming data is received serially at serial port 3 and conveyed to input port 112, when it is desired to update the code data and/or instructions in the RAM 54.
The three infrared-emitting LEDs, LED 1, LED 2, and LED 3 are connected in the circuitry 42 as shown.
The reset circuit 74 includes two resistors and a capacitor connected as shown and coupled between line VCC and a reset line 184.
As will be described in greater detail in connection with the description of
After the infrared code is deciphered, the code data theefor and instructions for generating such code (see the flow chart in
It is to be noted that the circuitry 42 has no ROM and all instruction codes and code data are loaded directly into the RAM 54. This allows for infinite upgradability in the field via the serial ports 1, 2, 3.
Later, after the device 10 has been in use for some time and the RAM 54 needs to be updated with instruction codes and data relative to new equipment on the market, the control device 10 can be simply and easily updated at a service outlet having an ordinary personal computer with a serial port using a novel nine pin to three pin, 9 volt to 5 volt, signal coupling and converting assembly 206 (FIG. 20). The updating can be done by adding to the data in RAM 54 or by rewriting (writing over) the data in RAM 54. The assembly 206 is described in greater detail hereinafter in connection with the description of
The infrared codes to be learned include a wide range of different codes for operating different electrical apparatus manufactured by the same or different manufacturers. In
In addition to these schemes, there is also a transmitter which puts out a different continuous frequency (CW) for each key as represented in
Finally, several new types of transmitters do not use a carrier frequency at all but instead send a stream of pulses where the dat is encoded in the spaces between the infrared pulses as shown in
Data modulation schemes for most transmitters have a higher level of data organization which may be called a keyboard encoding scheme which causes different data to be sent depending upon the transmitter and the key pressed. This will be described in greater detail hereinafter in connection with
The code data for the infrared codes may be obtained from vendor information sheets and specifications, can be determined using the methods disclosed in U.S. Pat. Nos. 4,623,887 and 4,626,848, or by the method disclosed herein.
In the method for learning or acquiring code data for infrared codes disclosed herein, no counting of pulses is carried out. Instead the method involves the following steps:
Typically, each pulse has a fixed duty cycle and in carrying out the above described method it can be assumed that each pulse has a fixed duty cycle.
The manual and computer steps followed in practicing this method are set forth in
There is shown in
The steps of this procedure include:
DEVICE BLINK CODES AND SPECIAL FEATURE BUTTONS
A B C D E F G H
MTS Pict + Pict − Sleep TV/Video
25 = Col Up
26 = Col Dn
27 = Brt Up
28 = Brt Dn
29 = Hue Up
30 = Hue
31 = Mtx
32 = Reset
Screen Sp Phne/
Dn Prnt Ctl
A Ch Hi Fi
Time/Ch Program TV/VCR
Pwr On Pwr Off Display Ant
Aux Last Ch Timer
Fine Dn L Ctl R Ctl OBC Func Review
25 = Stereo
26 = TimeFa
27 = Timer
28 = TimeSl
29 = TV/AV
Fine Dn L Ctl R Ctl OBC Func Review
25 = Stereo
26 = TimeFa
27 = Timer
28 = TimeSl
29 = TV/AV
Tint R Tint L Color R Color L
24 = SAP
25 = Reset
26 = Q/V
27 = EXP
29 = Mono
30 = Lock
31 = TV
32 = Ext 1
33 = Ext 2
34 = Ant
Wide Lvl Up Lvl Dn Memory Func MTC Stereo
25 = Timer
26 = 100
27 = BiLing
10 11 12 13
RF12 Ch Rtn Str SAP Mono Timer T Set TV/CATV
26 = 100
27 = Audio
28 = CCC1
29 = CCC2
30 = CCC3
31 = 32 = 33 =
34 = Pict
35 = Reset
SAP Sleep TV/Video
Q Rev SAP Sleep TV/Video
Sleep St/SAP TV/Video
11 12 13 14 15 16
VIDEO CASSETTE RECORDERS
Slow Slow Up Slow Dn
A B C D E F Slow
Slow + Slow − Eject CM Skip
Input Mode AM/PM
28 = Shift
29 = Reset
30 = Mem/PS
31 = SR
Ant Vol + Vol − Reverse
11 12 13 14 15 16
Memory Reset Chg Time
Pwr On Pwr Off
Slow Slow Up Slow Dn Set Up Set Dn Timer Clear Display
29 = Frame
30 = Memory
31 = Prog
32 = Qtr
33 = QtrStr
34 = Quick
35 = 36 = Rst
37 = Clock
38 = APS
39 = 100
Slow OSP Shift L Shift R
St + St −
28 = Timer
11 12 13 14 15 16 Slow
Slow Up Slow
A/B Add Delete Set Lock Last Ch
A B Event(*)
# Arrow Up
25 = F 26 = K 27 = Learn
28 = PGM
29 = TCP
30 = Enter
Skew L Skew R Audio SAT Ant East
Plus Minus Dot Box Str Clear Time Auth
22 = C/R
23 = #
Plus Minus Rcp * M1 M2 M3 M4
A-B Dot 1 Dot 2 * Am Dm F
COMPACT DISK PLAYERS
CD Fwd CD BckUp
For numbered functions, press “DO” then the two digit number.
The instructions for using the control device 10 which are supplied to a purchaser thereof in an instruction booklet are set forth below.
Matching the Device to Your Equipment
The device 10 can control most remote controlled TV's, VCR's, cable converters, and CD players, but it needs the user's input to match it to your particular equipment. The easiest way to do this is to STEP-and-SET your device 10. You will only need to do this once for each different type of device you have.
Besides the basic functions such as channel up/down and volume up/down that most TV remote controls have, there could be special features as well, for example:
Once you have matched the device 10 to your TV, VCR, Cable Converter and CD player, all functions that were controlled by your old remote control devices can now be controlled by the device 10. You may even notice some extra features that weren't controlled by your old remote.
Since the device 10 can control such a wide range of equipment, there is not enough room on it for buttons for every possible feature of every remote control. Instead, there are eight extended function buttons at the bottom labelled A through H. To find out what these eight buttons control for your particular TV, VCR, cable converter and CD player:
A: Color Up
C: Picture Up
B: Color Down
D: Picture Down
Usually, the eight A through H buttons are enough for most controlled equipment. If they're not, don't worry. If your controlled equipment has more than eight special features these too are controlled by the device 10.
Beyond the A through H function buttons, any additional functions are performed by pressing DO then two of the 0-9 number buttons. For example, your TV's feature chart may show additional functions like these:
If you did have these features and wanted to use them, you would press DO and then the two-digit number for that feature. For example, you might:
Press DO,3,0. This would turn your TV's stereo broadcast feature on.
If you use a feature like this frequently you may want to assign it to a DO command, our next topic of discussion.
Setting DO Commands
DO Commands give you the power to perform a multitude of different functions with the push of just one or two buttons. DO Commands let you assign any of the following buttons to tell the device 10 to automatically perform a series of keystrokes you use often:
To tell the device 10 to do what you want, your must teach it. As an example, you can teach the device 10 to turn your whole system on and set the TV to channel 4 by doing the following:
Now you have pressed all the buttons you want the device 10 to learn for this example.
Now the device 10 knows how to turn your TV, VCR, and cable converter on and set the TV to channel 4, just by pressing one button.
Now that you know how DO Commands work, you can teach the device 10 to “DO” practically any sequence of keystrokes. Just remember to keep the following in mind:
To perform a DO Command, press DO then the button you assigned to remember the DO Command. However, if you assigned the DO1 or DO buttons to remember a DO Command, you do not have to press DO first, just press DO1 or DO.
If the device 10 light (LED4) starts blinking green, yellow, red while you are trying to teach it, it is telling you that RAM 54 is full. The DO command you are teaching is automatically erased. You can teach the device 10 a shorter DO command, or erase some other DO command you have already taught the device 10 to obtain more memory space.
After the DO Command is finished, the last apparatus 10 selected within the DO Command will be the apparatus the device 10 will work with next.
Erasing a DO command
If you just want to change a DO Command, you do not have to erase it first-just set up the new DO Command in its place. However, to get rid of a DO Command without replacing it with a new one:
There is a quicker way to match your equipment to the device 10 by Quick-Matching. Quick-Matching is a way to set the device 10 directly to match any controlled equipment in its library. Follow the steps below to do a Quick-Match:
One of the great benefits of Quick-Matching is that you can switch the device 10 functions between the remote controlled TVs, VCRs and cable converters you may own. This is done by using “Quick-Match” within a “DO command”.
Let's suppose you have two TVs in your house and only one device 10. Here's how to switch between them:
For example, press DO. This tells the device 10 that you want to teach it a DO Command.
Now, to set the device 10 to control your second TV, press DO. This tells the device 10 that you will be controlling your second TV.
To go back to controlling your first TV, simply teach device 10 another “DO command”. Just repeat the steps above, except use a different button and the correct R and G sequence for your first TV.
The device 10 can easily be taught to control a whole houseful of infrared remote controlled equipment—just teach the device 10 a DO Command to QUICK-MATCH each additional piece of equipment.
Serial information is transmitted by the hand held control device 10 via line HTXD at serial port 1 and is level translated by the operating circuitry 42 from a range of from plus 5 volts to zero volts to a range of from minus 9 volts to plus 9 volts.
In this respect, when 0 volts is present at serial port 1, transistors Q1 and Q2 are turned on such that +9 volts is supplied from pin 4 of connector DB-9 or pin 20 of connector DB25 through transistor Q1 to pin 2 of connector DB-9 or pin 3 of connector DB-25.
Then, when +5 volts is present at serial port 1, the emitter-base of transistor Q2 is reverse biased, turning off transistor Q2 which turns off transistor Q1. As a result, the 9 volts at pin 7 of connector DB-9 or pin 4 of connector DB-25 is supplied through resistor 270 to pin 2 of connector DB-9 or pin 3 of connector DB-25.
The circuit portion 230B is shown in FIG. 22 and performs a receiving function for the control device 10. When pin 3 of connector DB-9 or pin 2 of connector DB-25 is at −9 volts, its normal resting state, then HTXD at serial port 3 is at 0 volts. When pin 3 of connector DB-9 or pin 2 of connector DB-25 goes to +9 volts, HTXD at serial port 3 goes to plus 5 volts. Pin 5 of connector DB-9 or pin 7 of connector DB-25 is directly connected to serial port 2 and always stays at ground.
In transmitting data to the control device 10, the programming computer supplies +9 v or −9 v to pin 3 of connector DB-9 or pin 2 of connector DB-25. When +9 v is present on IBMTXD, 4.3 volts established by Zener diode 272 is passed through diode 274 to serial port 3.
When −9 v is present on IBMTXD, the Zener diode 272 clamps to −0.6 volts resulting in conduction through transistor Q3 pulling serial port 3 to 0 volts.
The diode 274, the transistor Q3 and a resistor 276 connected as shown are provided to allow pressing a key 25 on keyboard 26 to “wake up” CPU 56 (actuate the wake up circuit 70) even though circuit portion 230B is connected to the control device 10.
From the foregoing description, it will be apparent that the universal remote control device 10, the signal coupling and converting assembly 206, the disclosed methods of learning and storing infrared codes, and the methods for operating the control device 10 of the present invention have a number of advantages, some of which have been described above and others of which are inherent in the device 10, assembly 206 and the methods of the invention disclosed herein. For example:
Also modifications can be made to the device 10, the assembly 206 and the described methods of the present invention without departing from the teachings of the present invention. Accordingly, the scope of the invention is only to be limited as necessitated by the accompanying claims.
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|U.S. Classification||341/175, 340/815.65, 348/E05.096, 340/815.45, 340/815.69|
|International Classification||G08C19/28, H03J1/00, H04B10/10, H04N5/44, G08C23/04, H04B1/20, H01H9/02|
|Cooperative Classification||H04N21/42221, H04N21/42225, H04B10/116, H03J2200/24, G08C2201/21, H01H2221/056, G08C19/28, H04B1/202, H03J1/0025, H04N5/44, G08C2201/33, G08C2201/92, G08C23/04, H04B10/114, H01H9/0235, H01H2009/189, G08C2201/20|
|European Classification||H04B10/114, H04B1/20B, H04N5/44, H03J1/00A2, G08C23/04, G08C19/28|
|Mar 2, 2009||REMI||Maintenance fee reminder mailed|
|Aug 23, 2009||LAPS||Lapse for failure to pay maintenance fees|
|Oct 13, 2009||FP||Expired due to failure to pay maintenance fee|
Effective date: 20090823